US PATENT SUBCLASS 173 / 143
.~.~ Intermittent unidirectional rotation of advance element

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

141  DF  ADVANCE CAUSING OR CONTROLLING MEANS {6}
142  DF  .~ Operated solely by vibrations from reciprocating element in tool drive {1}
143.~.~ Intermittent unidirectional rotation of advance element

DEFINITION

Classification: 173/143

(under subclass 142) Apparatus in which the movement resulting from the pulsations causes an element of the means moving the tool forward to move unidirectionally step by step about an axis.